Topic on Talk:Deus Ex: Invisible War
Just tested this on Win7. It appears that after installing the mod you have to manually edit the config file:
C:\Users\[UserName]\Documents\Deus Ex - Invisible War\Options\Options.ini
Under [VideoOptions] set the MultiSampling= value to your liking.
In any case, using the in-game option doesn't seem to noticeably improve its visual quality (due to how UE2 handles antialiasing). I've had much better results with forced adaptive AA (plus AF), which on my end works flawlessly.